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Finding the Fourth Proportional to 918.28, 1,374.78 and 702.28

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Solution

The fourth proportional to 918.28, 1,374.78 and 702.28 is: 1,051.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    918.28 : 1,374.78 = 702.28 : x
  2. Step 2: Convert to fraction form
    918.28/1,374.78 = 702.28/x
  3. Step 3: Cross multiply
    918.28x = 1,374.78 × 702.28
  4. Step 4: Simplify right side
    918.28x = 965,480.50
  5. Step 5: Solve for x
    x = 965,480.50/918.28
  6. Step 6: Final answer
    x = 1,051.40

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.